Origin: Carved out of several adjacent towns, this town was named in honor of Governor John Langdon. Governor Langdon was active in the Revolution, and also owned a ship-building business in Portsmouth. He was a delegate to the Constitutional Convention and served on a committee with Benjamin Franklin and John Adams to secure military supplies for the American forces. Governor Langdon served as a member of the State senate, was Speaker of the House of Representatives, and served as president pro-tem of the Senate in the first United States Congress, supervising the canvass of electoral votes to elect Washington as President. He was an eight-term Governor of New Hampshire.

Villages and Place Names: Cold River District, Condon Corner

Population, Year of the First Census Taken: 244 residents in 1790

Population Trends: Population change for Langdon totaled 483 over 55 years, from 338 in 1960 to 821 in 2015. The largest decennial percent change was a 33 percent increase between 1980 and 1990, followed by a 30 percent increase over the previous decade. The 2015 Census estimate for Langdon was 821 residents, which ranked 197th among New Hampshire's incorporated cities and towns.

Population Density and Land Area, 2015 (US Census Bureau): 50.3 persons per square mile of land area. Langdon contains 16.3 square miles of land area and 0 square miles of inland water area.

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